Category: Physics

Does a force meter measure weight? The weight of something (or someone) is the force caused by the pull of gravity on the mass of something (or someone). Weight is measured in Newtons (N) and is named after Sir Isaac Newton, who discovered gravity. A force meter (or Newton meter) is used to measure weight. […]

What is the formula for input work? It will be necessary to determine force when you want to calculate the work input in a pulley or a system of pulleys. Work is determined by multiplying force by distance traveled: Work (W) = Force (F)X Distance (d) W=Fd. What is the formula of efficiency of a […]

What is the relationship between temperature and height in the mesosphere? The mesosphere is directly above the stratosphere and below the thermosphere. It extends from about 50 to 85 km (31 to 53 miles) above our planet. Temperature decreases with height throughout the mesosphere. The coldest temperatures in Earth’s atmosphere, about -90° C (-130° F), […]

How can I impress my teacher in one day? 10 ways to impress your professor (without being the teacher’s… Be early. Make eye contact during class. Ask follow-up questions. Take advantage of office hours. When you must miss a class, e-mail the professor. Proofread your work. Thank the professor for a particularly interesting class. Take […]

What is the value of the spring constant k? The letter k represents the “spring constant,” a number which essentially tells us how “stiff” a spring is. If you have a large value of k, that means more force is required to stretch it a certain length than you would need to stretch a less […]

How do you explain pressure altitude? Pressure altitude is the attitude displayed on the altimeter when the Kollsman window is set to 29.92 inches of mercury, or 1013.4 millibars. Pilots cannot use pressure altitude below 18,000 feet, because then the aircraft’s true altitude would change depending on temperature. Why do we calculate pressure altitude? Pressure […]

What are ferromagnetic and antiferromagnetic materials? Ferromagnetic materials have magnetic moments that align parallel to the applied magnetic field whereas antiferromagnetic materials have antiparallel magnetic moments. Therefore the magnetic moments still cancel each other out and the overall magnetization is zero. What is hysteresis loop explain with diagram? A hysteresis loop shows the relationship between […]

Why is it called a diverging lens? The concave lens is a diverging lens, because it causes the light rays to bend away (diverge) from its axis. In this case, the lens has been shaped so that all light rays entering it parallel to its axis appear to originate from the same point, F, defined […]

How do I get rid of the small screen on my TV? How to display or remove the Picture In Picture (PIP) window on the television screen. Pressing the small PIP button a second time decreases the size of the PIP window. Pressing the small PIP button a third time will remove the PIP window […]

What is called critical angle? When the angle of incidence in water reaches a certain critical value, the refracted ray lies along the boundary, having an angle of refraction of 90-degrees. This angle of incidence is known as the critical angle; it is the largest angle of incidence for which refraction can still occur. Why […]